js禁止页面中右键的简单实例

/**
* 禁止右键
* edit: www.jb200.com
*/
function click(e) {
if (document.all) {
if (event.button==1||event.button==2||event.button==3) {
oncontextmenu='return false';
}
}
if (document.layers) {
if (e.which == 3) {
oncontextmenu='return false';
}
}
}
if (document.layers) {
document.captureEvents(Event.MOUsedOWN);
}
document.onmousedown=click;
document.oncontextmenu = new Function("return false;")